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Influence of Melt Spinning on the Electrochemical Hydrogen Storage Kinetics of RE-Mg-Ni-Based A2B7-Type Alloys
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Influence of Melt Spinning on the Electrochemical Hydrogen Storage Kinetics of RE-Mg-Ni-Based A2B7-Type Alloys
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National Natural Science Foundations of China (51161015, 50961009); National “863”Plans Projects of China (2011AA03A408); Natural Science Foundation of Inner Mongolia, China (2011ZD10 and 2010ZD05)

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    摘要:

    合金的電化學(xué)貯氫動力學(xué)性能是其應(yīng)用于動力電池的重要因素。為了提高RE-Mg-Ni系A(chǔ)2B7型貯氫合金的動力學(xué)性能，用M (M=Pr, Zr) 部分替代La，并采用快淬處理制備了La0.65M0.1Mg0.25Ni3.2Co0.2Al0.1 (M=Pr, Zr)電極合金。研究了元素替代和快淬處理對合金結(jié)構(gòu)及電化學(xué)貯氫動力學(xué)性能的影響。XRD及TEM結(jié)果顯示，鑄態(tài)及快淬態(tài)合金均為多相結(jié)構(gòu)，包含(La, Mg)2Ni7和LaNi5主相以及少量的殘余相LaNi2。Pr替代快淬態(tài)合金為納米晶結(jié)構(gòu)，而Zr替代快淬態(tài)合金為類非晶結(jié)構(gòu)，說明Zr部分替代La促進(jìn)了非晶的形成。電化學(xué)測試表明合金的高倍率放電性能（HRD）隨著快淬速度的增加先增大后減小。此外，電化學(xué)阻抗譜（EIS），塔菲爾極化曲線以及電勢階躍測試均表明合金的電化學(xué)動力學(xué)性能隨著快淬速度的增加先增大后減小

    Abstract:

    In order to improve the electrochemical characteristics of the La-Mg-Ni system A2B7-type electrode alloys, the partial substitution of M (M=Pr, Zr) for La has been performed. The melt spinning technology was used to prepare the La0.65M0.1Mg0.25Ni3.2Co0.2Al0.1 (M=Pr, Zr) electrode alloys. The influences of the melt spinning and substithting La with M (M=Pr, Zr) on the structures and the electrochemical hydrogen storage kinetics of the alloys were investigated. The results obtained by XRD and TEM reveal that the as-cast and spun alloys hold a multiphase structure, containing two main phases (La, Mg)2Ni7 and LaNi5 as well as a residual phase LaNi2. The as-spun (M=Pr) alloy displays an entire nanocrystalline structure, while an amorphous-like structure is detected in the as-spun (M=Zr) alloy, implying that the substitution of Zr for La facilitates the amorphous formation. The electrochemical measurement indicates that the high rate discharge ability (HRD) of the alloys first mounts up and then falls with rising of spinning rate. Furthermore, the electrochemical impedance spectrum (EIS), the Tafel polarization curves and the potential-step measurements all indicate that the electrochemical kinetics first increase and then decreases with growing of spinning rate

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張羊換,蔡 穎,楊 泰,侯忠輝,張國芳,趙棟梁. Influence of Melt Spinning on the Electrochemical Hydrogen Storage Kinetics of RE-Mg-Ni-Based A2B7-Type Alloys[J].稀有金屬材料與工程,2013,42(11):2201~2206.[Zhang Yanghuan, Cai Ying, Yang Tai, Hou Zhonghui, Zhang Guofang, Zhao Dongliang. Influence of Melt Spinning on the Electrochemical Hydrogen Storage Kinetics of RE-Mg-Ni-Based A2B7-Type Alloys[J]. Rare Metal Materials and Engineering,2013,42(11):2201~2206.]
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  • 收稿日期:2012-11-25
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